In French an ADJECTIVE must always agree with the noun that it is describing. Many adjectives in French have a masculine form and a feminine form - and quite often, different forms for the masculine and feminine PLURALS as well.
Most adjectives in French go *after* the noun they describe.
*usually* an "s" is added to the end of the masculine form of the adjective, to make the masculine plural version.
*usually* an "e" is added at the end of the masculine form of the adjective, to make the feminine.
*usually* an "s" is added to the end of the feminine singular form of the adjective, to make the feminine plural version.

So we have the following forms of the adjective "bleu", meaning "blue":

bleu (m) (s)
bleus (m) (pl)
bleue (f) (s)
bleues (f) (pl)


MASCULINE AND FEMININE adjectives - regular
Here are a few "regular" examples of the way the adjective changes to "agree":


court (m.s)
courts (m.pl)
courte (f.s)
courtes (f.pl)
short
vert (m.s)
verts (m.pl)
verte (f.s)
vertes (f.pl)
green
noir (m.s)
noirs (m.pl)
noire (f.s)
noires (f.pl)
black
haut (m.s)
hauts (m.pl)
haute (f.s)
hautes (f.pl)
high
The adjective is matched up here with the noun it describes:


le chat noir
the black cat
les chats noirs
the black cats
la pomme verte
the green apple
les pommes vertes
the green apples
MASCULINE AND FEMININE adjectives - ending in 'e'


When the *masculine* form of the adjective already ends in "e"-without-an-accent, you don't need to add another one to make the feminine form.


rouge (m.s)
rouges (m.pl)
rouge (f.s)
rouges (f.pl)
red
jaune (m.s)
jaunes (m.pl)
jaune (f.s)
jaunes (f.pl)
yellow
jeune (m.s)
jeunes (m.pl)
jeune (f.s)
jeunes (f.pl)
young
célèbre (m.s)
célèbres (m.pl)
célèbre (f.s)
célèbres (f.pl)
famous

The adjective is matched up here with the noun it describes:


le moulin rouge
the red mill
les moulins rouges
the red mills
la fille célèbre
the famous girl
les filles célèbres
the famous girls


MASCULINE
AND FEMININE adjectives - ending in 'n' or 'l'


Sometimes adjectives end in a consonant (usually an "n" or an "l") which gets *doubled* to create the feminine form. The 's' for plural gets added to either the masculine or the feminine form, as appropriate.
gentil (m.s)
gentils (m.pl)
gentille (f.s)
gentilles (f.pl)
kind
naturel (m.s)
naturels (m.pl)
naturelle (f.s)
naturelles (f.pl)
natural
bon (m.s)
bons (m.pl)
bonne (f.s)
bonnes (f.pl)
good
ancien (m.s)
anciens (m.pl)
ancienne (f.s)
anciennes (f.pl)
former, senior

Not all adjectives ending in "n" or "l" follow this rule, as in:
plein (m.s)
pleins (m.pl)
pleine (f.s)
pleines (f.pl)
full
central (m.s)
centraux (m.pl)
centrale (f.s)
centrales (f.pl)
central


MASCULINE AND FEMININE adjectives - ending in "er" or "et"


Sometimes adjectives ending in -er or -et and add a *grave accent* on the e-before-the-last-character as well as an "e" right-at-the-end. The 's' for plural gets added to either the masculine or the feminine form, as appropriate.
premier (m.s)
premiers (m.pl)
première (f.s)
premières (f.pl)
first
cher (m.s)
chers (m.pl)
chère (f.s)
chères (f.pl)
dear, expensive
entier (m.s)
entiers (m.pl)
entière (f.s)
entières (f.pl)
whole, entire
dernier (m.s)
derniers (m.pl)
dernière (f.s)
dernières (f.pl)
last
complet (m.s)
complets (m.pl)
complète (f.s)
complètes (f.pl)
complete
secret (m.s)
secrets (m.pl)
secrète (f.s)
secrètes (f.pl)
secret


MASCULINE AND FEMININE adjectives - ending in "x"

There are about 22 adjectives that you may wish to commit to memory. Let's start with those ending in "x", where the masculine plural form is the *same* as the masculine singular - the adjective "gris" follows this pattern also.

heureux (m.s)
heureux (m.pl)
heureuse (f.s)
heureuses (f.pl)
happy
paresseux (m.s)
paresseux (m.pl)
paresseuse (f.s)
paresseuses (f.pl)
lazy
ennuyeux (m.s)
ennuyeux (m.pl)
ennuyeuse (f.s)
ennuyeuses (f.pl)
boring
faux (m.s)
faux (m.pl)
fausse (f.s)
fausses (f.pl)
false
doux (m.s)
doux (m.pl)
douce (f.s)
douces (f.pl)
soft
jaloux (m.s)
jaloux (m.pl)
jalouse (f.s)
jalouses (f.pl)
jealous
vieux [nb vieil before
a vowel or silent h]

vieux (m.pl)
vieille (f.s)
vieilles (f.pl)
old
gris (m.s)
gris (m.pl)
grise (f.s)
grises (f.pl)
grey